How to change to jpg?

[GG]

I've created a photo album but cannot upload the pics coz they say muz change my pics to jpg first.
I scanned the photos already, what should i do next to change them into jpg?

[leon]

For mi is i open using the paint then save as a new file.
then become jpg liao..

[GG]

i dunno how to open the file!!! coz when i click on open.... there r no files!!!